number类型

2.string

表示字符串

let str:string = '你好,鸿蒙';
let str1:string = 'hello world'
console.log(str);
console.log(str1);

 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="1"> class="hljs-ln-code"> class="hljs-ln-line">let str:string = '你好,鸿蒙';
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="2"> class="hljs-ln-code"> class="hljs-ln-line">let str1:string = 'hello world'
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="3"> class="hljs-ln-code"> class="hljs-ln-line">console.log(str);
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="4"> class="hljs-ln-code"> class="hljs-ln-line">console.log(str1); class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

string类型

3.boolean

表示布尔值,true或false

let flag:boolean = true;
let pass:boolean = false;
console.log(flag);
console.log(pass);

 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="1"> class="hljs-ln-code"> class="hljs-ln-line">let flag:boolean = true;
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="2"> class="hljs-ln-code"> class="hljs-ln-line">let pass:boolean = false;
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="3"> class="hljs-ln-code"> class="hljs-ln-line">console.log(flag);
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="4"> class="hljs-ln-code"> class="hljs-ln-line">console.log(pass); class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

boolean类型

4.数组

数组由两部分组成,元素类型[],例如number[]表示number的数组,string[]表示string的数组

数组类型的变量可以由数组字面量[item1,item2,item3]进行初始化

let a:number[] = [];
let b:string[] = ['你好','鸿蒙'];
console.log(b[0]+b[1]);
let arr:number[] = [1,2,3];
console.log(arr);

 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="1"> class="hljs-ln-code"> class="hljs-ln-line">let a:number[] = [];
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="2"> class="hljs-ln-code"> class="hljs-ln-line">let b:string[] = ['你好','鸿蒙'];
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="3"> class="hljs-ln-code"> class="hljs-ln-line">console.log(b[0]+b[1]);
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="4"> class="hljs-ln-code"> class="hljs-ln-line">let arr:number[] = [1,2,3];
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="5"> class="hljs-ln-code"> class="hljs-ln-line">console.log(arr); class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

数组

输出数组

5.对象Object

TS中,对象Object是一种一系列由属性名称和属性值组成的数据类型,如姓名旧约,年龄24,性别男

对象类型的声明需要包含名称和类型

let person:{name:string,age:number,gender:string}

let person:{name:string,age:number,gender:string} class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

对象的变量可以通过字面量进行初始化

let person:{name:string,age:number,gender:string} = {name:"旧约",age:24,gender:'男'}
console.log(person.name);

 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="1"> class="hljs-ln-code"> class="hljs-ln-line">let person:{name:string,age:number,gender:string} = {name:"旧约",age:24,gender:'男'}
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="2"> class="hljs-ln-code"> class="hljs-ln-line">console.log(person.name); class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

Object类型

获取对象属性

6.Function函数

声明函数需要定义函数的关键字,函数名称,函数体,函数体返回值,参数名称,参数类型,函数返回值类型

function sum(a:number,b:number):number{
  return a + b;
}
console.log(sum(1,2));

 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="1"> class="hljs-ln-code"> class="hljs-ln-line">function sum(a:number,b:number):number{
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="2"> class="hljs-ln-code"> class="hljs-ln-line">  return a + b;
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="3"> class="hljs-ln-code"> class="hljs-ln-line">}
 class="hljs-ln-numbers"> class="hljs-ln-line hljs-ln-n" data-line-number="4"> class="hljs-ln-code"> class="hljs-ln-line">console.log(sum(1,2)); class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}" onclick="hljs.signin(event)">

function函数

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